Radiometrix Ltd., TX2 & RX2 Data Sheet

page 7

Module mounting considerations

The modules may be mounted horizontally or vertically on an area of ground plane preferably close to

the antenna to minimise feed length. The receiver and it’s antenna should be kept away from sources of

interference (micro’s, SMPS etc.). The modules may be potted if required in a viscous compound which

can not enter the screen can..

Warning: Do NOT wash the modules. They are not hermetically sealed.

Antenna requirements

Three types of integral antenna are recommended and approved for use with the module:

A. Helical antenna

B. Loop antenna

RF

C1

C2

C4

C3

RF-GND

C. Whip antenna

16.4cm

RF

0.5 mm enameled copper wire

close wound on 3.2 mm diameter former

433 MHz = 24 turns

Feed point 15% to 25% of total loop length

track width = 1mm

4 to 10 cm inside area

wire, rod, PCB-track or a combination

of these three

433 MHz = 16.4 cm total from RF pin.

2

RF

A

B

C

helical

loop

whip

Ultimate performance

**

*

***

Easy of design set-up

**

*

***

Size

***

**

*

Immunity proximity effects

**

***

*

Range open ground to similar antenna

(for TX2-433-14-5V & RX2-433-14-5V)

200m

100m

300m

Fig. 7: module mounting options

Fig.8: Antenna

Antenna selection chart